Components Summary
Let's summarize the functions of the four main cooling cycle components by tracking the conditions of refrigerant in the system. These conditions are typical for a comfortable air conditioning system that uses R-22 as the refrigerant. They peak load and peak power.
Evaporator absorbs heat from the air-conditioned comfort in the refrigerant. The heat causes the refrigerant to a boil, what changes refrigerant from low temperature (40F), low pressure (69 psi), saturated liquid-vapor mixture at low temperature (50F), low pressure (69 psi), superheated gas.
As the gas enters the compressor, it shrinks, then compressed, so that it leaves the compressor high temperature (170F), high-pressure (263 PSIG), superheated gas. As the gas passes through the condenser, the heat is rejected from the refrigerant, so it turns into a high temperature (105F), high-pressure (263 PSIG), supercooled liquids.
The dosing device takes the liquid, and to regulate the flow in the evaporator, puts it through pressure drop. In the process of refrigerant changes in low temperature (40F), low pressure (69 psi), saturated liquid-vapor mixture. Refrigerant will repeat the loop by entering the evaporator in that condition...
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Refrigeration 
